It was loaded from the following location: file:/Users/wangjun/.m2/repository/javax/persistence

一、報錯信息： 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-06-17 19:59:42.456 ERROR 9977 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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APPLICATION FAILED TO START
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Description:

An attempt was made to call a method that does not exist. The attempt was made from the following location:

    org.hibernate.jpa.boot.internal.PersistenceUnitInfoDescriptor.getValidationMode(PersistenceUnitInfoDescriptor.java:88)

The following method did not exist:

    javax.persistence.spi.PersistenceUnitInfo.getValidationMode()Ljavax/persistence/ValidationMode;

The method's class, javax.persistence.spi.PersistenceUnitInfo, is available from the following locations:

    jar:file:/Users/wangjun/.m2/repository/javax/persistence/persistence-api/1.0/persistence-api-1.0.jar!/javax/persistence/spi/PersistenceUnitInfo.class
    jar:file:/Users/wangjun/.m2/repository/jakarta/persistence/jakarta.persistence-api/2.2.3/jakarta.persistence-api-2.2.3.jar!/javax/persistence/spi/PersistenceUnitInfo.class

It was loaded from the following location:

    file:/Users/wangjun/.m2/repository/javax/persistence/persistence-api/1.0/persistence-api-1.0.jar


Action:

Correct the classpath of your application so that it contains a single, compatible version of javax.persistence.spi.PersistenceUnitInfo

Disconnected from the target VM, address: '127.0.0.1:64263', transport: 'socket'

Process finished with exit code 1

二、原因分析：

項目是SpringBoot+mybatis，在pom.xml文件中引入了tk.mybatis的依賴，因爲tk.mybatis會自動引用依賴引入persistence-api-1.0.jar包，而persistence-api-1.0.jar的PersistenceUnitInfo類中並沒有getValidationMode()方法，而在springboot（2.1.0.RELEASE）中自動引入的依賴persistence-api-2.2.jar包的PersistenceUnitInfo類則有實現getValidationMode()方法。此時兩個類衝突了，導致報了以下的錯誤。解決方法就是在tk.mybatis中排除掉persistence-api-1.0.jar的自動依賴

三、解決方法

錯誤的引入方法：

<!--通用Mapper -->
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper</artifactId>
            <version>4.1.5</version>
        </dependency>

正確的引入方法： 

<!--通用Mapper -->
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper</artifactId>
            <version>4.1.5</version>
            <exclusions>
                <exclusion>
                    <groupId>javax.persistence</groupId>
                    <artifactId>persistence-api</artifactId>
                </exclusion>
            </exclusions>
        </dependency>